linux-kernel - Re: [PATCH 1/5] soc: mediatek: Add SMI driver

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Date:	Tue, 10 Mar 2015 10:05:59 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Yingjoe Chen <yingjoe.chen@...iatek.com>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Mark Rutland <mark.rutland@....com>,
	devicetree@...r.kernel.org, linux-mediatek@...ts.infradead.org,
	srv_heupstream@...iatek.com,
	Catalin Marinas <catalin.marinas@....com>,
	Joerg Roedel <joro@...tes.org>,
	Will Deacon <will.deacon@....com>,
	linux-kernel@...r.kernel.org, Tomasz Figa <tfiga@...gle.com>,
	iommu@...ts.linux-foundation.org, Rob Herring <robh+dt@...nel.org>,
	Daniel Kurtz <djkurtz@...gle.com>,
	Sasha Hauer <kernel@...gutronix.de>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Robin Murphy <robin.murphy@....com>, yong.wu@...iatek.com,
	Lucas Stach <l.stach@...gutronix.de>, thierry.reding@...il.com
Subject: Re: [PATCH 1/5] soc: mediatek: Add SMI driver

On Tuesday 10 March 2015 14:27:04 Yingjoe Chen wrote:
> On Mon, 2015-03-09 at 22:56 +0100, Arnd Bergmann wrote:
> > On Monday 09 March 2015 11:26:52 Yingjoe Chen wrote:
> > > On Fri, 2015-03-06 at 18:48 +0800, yong.wu@...iatek.com wrote:
> > > > From: Yong Wu <yong.wu@...iatek.com>
> > > > 
> > > >     This patch add SMI(Smart Multimedia Interface) driver. This driver is
> > > > responsible to enable/disable iommu and control the clocks of each
> > > > local arbiter.
> > > > 
> > > > Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> > > > ---
> > > >  drivers/soc/mediatek/Kconfig      |   7 ++
> > > >  drivers/soc/mediatek/Makefile     |   1 +
> > > >  drivers/soc/mediatek/mt8173-smi.c | 143 ++++++++++++++++++++++++++++++++++++++
> > > >  include/linux/mtk-smi.h           |  40 +++++++++++
> > > >  4 files changed, 191 insertions(+)
> > > >  create mode 100644 drivers/soc/mediatek/mt8173-smi.c
> > > >  create mode 100644 include/linux/mtk-smi.h
> > > > 
> > > 
> > > Hi Arnd, Matthias,
> > > 
> > > For the SMI driver, we can't find a better place, so we put it in
> > > drivers/soc/mediatek now. Please let us know if you have any suggestion
> > > or concern. Thanks
> > 
> > From what I understand from your description, I think it would better
> > fit in drivers/iommu. Another option is drivers/memory, which I think
> > is where the respective Tegra driver ended up.
> 
> Hi Arnd,
> 
> The description above only describe what is implemented now. Besides
> that, SMI HW also does:
> 
> - Prioritize/arbitrate memory requests between different ports & larbs.
> - Bandwidth limiter
> - Performance monitor
> 
> I think drivers/memory make more sense. I can't find info about
> drivers/memory in MAINTAINERS. Can this go through ARM SoC tree if we
> put SMI driver there?
> 

Yes, that works for me. I'd like to see a review from Thierry Reding
though, since he wrote the Tegra driver that is used for very similar
hardware, and I want to make sure you two are on the same page with
the internal APIs.

	Arnd
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